<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click.prevent="addFn">添加</button>
      <button @click.prevent="change(index)">修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
        v-show="arr.length > 0 ? true : false"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="editFn(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      name: "",
      age: "",
      sex: [],
      index: 0,
      arr: [
        {
          name: "小垃圾",
          age: 18,
          sex: "男",
          id: 1,
        },
       
      ],
    };
  },
  methods: {
    //添加按钮函数
    addFn() {
      
      if (
        this.name.trim().length === 0 ||
        this.age.length === 0 ||
        this.sex.length === 0
      ) {
        return alert("请输入完整的信息");
      }
      
      //添加数据
      this.arr.unshift({
        name: this.name,
        age: this.age,
        sex: this.sex[0],
        id: +new Date(),
      });
      this.name = "";
      this.age = "";
      this.sex = [];
    },
    //编辑按钮函数
    editFn(index) {
      
      //  点击编辑功能, 把值赋予到输入框上
      //获取点击的那个
      this.name = this.arr[index].name;
      this.age = this.arr[index].age;
      this.sex = this.arr[index].sex;
      this.index = index;
    },
    //修改按钮函数
    change(index) {
      //点击后   修改数组里的值
     
      this.$set(this.arr, index, {
        name: this.name,
        age: this.age,
        sex: this.sex[0],
      });
    },
    //删除按钮函数
    del(index) {
      this.arr.splice(index, 1);
    },
  },
};
</script>